separate build dir Select for out of tree builds using a separate build dir.
All the build artifacts will go to : PROJ_DIR/../PROJ_NAME_build'.

The builder defines the following default targets:

release build with variables debug=0, release=1

debug build with variables debug=1, release=0

default build with no variables set

clean build with -c flag

You could provide per project targets by creating the file targets.ini
alongside the sconstruct script. Each target is defined by [targetname],
followed by an entry specifying the SCons targets, and an entry giving the SCons
parameters: